Some more lore information, this is a little more relevant:
1 - Being a dual cultivator apparently does not result in a complete increase in power. Although it does make the individual harder to kill and more versatile. The individual cannot stack enhancements from different cultivation systems. For example, a character with Body 9 and Qi 10, their strongest attack would be a 10, not a 19... Honestly, I think this is more Nicky avoiding work... v( ̄ー ̄)v
2 - That story about the body TW made for the MC being just "very good but something any immortal could give him" was thrown out the window. Now, it's actually so good that the MC could reach the Divine without even cultivating Dao.